I agree with Denny, Martin is the best to clarify. Having said that, I’ll take a guess to see if I’m close: ‘total batch’ in my mind would be the volume of wort that has all processes complete into the fermenter. In my mind, post boil would mean the volume at flame out which may not include all processes complete prior to transfer to the fermenter.

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“From man’s sweat and God’s love, beer came into the world.” — St. Arnold